Credit to Peter MacPherson: I have a 1980 Sundowner with an O-360-A4K engine. Lately, no matter how aggressively I lean, I get a 200-300 rpm drop on the left mag when I do a mag check during run-up. It’s always on the left mag, and never on the r
Credit to Peter MacPherson: I have a 1980 Sundowner with an O-360-A4K engine. Lately, no matter how aggressively I lean, I get a 200-300 rpm…